PHYSICS HIGH SCHOOL

Why does water have a high surface tension?Hydrogen bonding keeps water molecules close together.
Water is a liquid at room temperature.
Water molecules contain 18 electrons.
The lengths of the bonds in water molecules can change.

Answers

Answer 1
Answer: Hydrogen bonding keeps water molecules close together.
Answer 2
Answer:

Answer:

HYDROGEN BONEDNDED

Explanation:

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Most of the Earth's volcanoes occurA. near the center of tectonic plates.B. where there are no tectonic plates.C. along tectonic plate boundaries.D. before tectonic plates can form.
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The answer to number 9 please

Answers

The magnitude is doubled. The direction doesn't change.

A block initially at rest on a horizontal, frictionless surface is accelerated by a constant horizontal force of 5 newtons. if 15 joules of work is done on the bock by this force, the kinetic energy of the block increases by

Answers

Answer: The kinetic energy of the block increases by 15 Joules.

Explanation:

Work done is defined as the product of force and displacement of the object.

Mathematically,

W=F.s

where,

W =work done

F = force

s = Displacement

Kinetic energy is defined as the energy which is possessed by the virtue of object's motion.

In the question, it is given that work done on block is 15 Joules and we need to find the change in kinetic energy of the block.

We know that,

Work done on the object = Change in kinetic energy of the object

Thus, Kinetic energy is increased by 15 Joules.

The kinetic energy depends on the work done by the applied force. The kinetic energy of the block increases by 15 J.

What is kinetic energy?

The energy possessed by an object by its motion is known as the object's kinetic energy.

Given data-

The magnitude of the constant horizontal force is F = 5 N.

The work done on the block is, W = 15 J.

As per the work-energy theorem, the work done by the applied force is equal to the change in kinetic energy.

Then,

W =  ΔKE

Solving as

15 = ΔKE

ΔKE = 15 J

Thus, we can conclude that the block's kinetic energy increases by 15 J.

Learn more about kinetic energy here:

brainly.com/question/999862

What is the unit of mu (m) in the equation of Ffriction=miu F formal explan
​

Answers

Both F's are forces, so µ must be unitless/dimensionless.

F[friction] = µ F[normal]

Or, more explicitly in terms of the units:

(Newtons) = (constant) (Newtons)

Karen shouts across a canyon and hears an echo 7.5 s later. how wide is the canyon? the speed of sound is 343 m/s. answer in units of m.

Answers

After Karen shouts, the sound wave of her voice travels across the canyon, it hits the walls, and then it comes back to Karen in a total time of t=7.5 s. If we call L the distance between Karen and the other side of the canyon (so, L is the width of the canyon), it means that the sound wave covers a distance of S=2L in this time.
Since the wave moves by uniform motion, we can use the usual relationship between space, time and velocity:
v= (S)/(t)= (2L)/(t)
where v=343 m/s is the speed of sound. Using this number, we can find L from the previous equation:
L= (vt)/(2)= ((343 m/s)(7.5 s))/(2)=1286 m
So, the canyon is 1286 meters wide.

A poet endowing animals, objects, or abstract ideas with human characteristics is using the figure of speech called _____.

Answers

The most likely answer is personification. However, if said poet addresses such phenomena directly as to another human, or in a manner of dialogue, they use a type of personification known as anthropomorphism.

Two diverging light rays, originating from the same point, have an angle of 5° between them. After the rays reflect from a plane mirror, what is the angle between them? Construct one possible ray diagram that supports your answer.

Answers

Answer:

5°  

Explanation:

Two diverging light rays, originating from the same point, have an angle of 5° between them.

According to laws of reflection the angle of incidence is equal to the angle of reflection.

From the attached figure, it is clear that the after reflection from a plane mirror the angle between two rays will be 5°.

O be the originating point. m and n two diverging light rays. When they strikes at the plane mirror, the laws of reflection still fulfilled.

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